Mandrel clamp for worm gear machining

Abstract

The utility model discloses a mandrel clamp for worm gear machining, which comprises a mandrel body, a chuck device, a locking sleeve and a limiting boss formed on the mandrel body, the mandrel body comprises a central concave hole arranged at one end of the mandrel body, the chuck device is clamped and fixed at the other end of the mandrel body, and the locking sleeve is arranged on the limiting boss. The locking sleeve is movably arranged on the mandrel body through a thread structure and is opposite to the other side of the limiting boss, so that the worm gear part arranged on the mandrel body in a sleeving manner is pressed and fastened on the limiting boss by the locking piece, the mandrel clamp can be used for quickly clamping the worm gear part and hobbing or grinding an outer circle, the machining precision is improved, and the machining efficiency is improved. The worm gear hobbing clamp is simple in structure and suitable for worm gears of different models, the part machining quality is improved, the machining efficiency is improved, the worm gear part can be turned into the outer circle grinding procedure after gear hobbing is completed through the mandrel clamp, two machining procedures can be completed through one-time clamping, and automatic production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of worm gear manufacturing and processing, in particular to a core shaft clamp used for worm gear processing. Background Art

[0002] In recent years, as my country's mechanical processing and manufacturing industry continues to develop towards higher quality, higher precision, and higher efficiency, more and more customers are demanding worm gear reducers that offer smooth transmission, low vibration, impact, and noise, and short delivery times. Worm gears are a key component of worm gear reducers, and instability in their machining can have a significant impact on product quality.

[0003] Existing worm gear parts need to go through multiple processes such as rough turning, fine turning, grooving, hobbing, outer circle grinding, deburring, and applying anti-rust oil. Among them, when hobbing the worm gear with a hobbing machine, the worm gear needs to be clamped on the machine tool workbench first. The hob rotates under the drive of the main shaft and is located on the outside of the worm gear for axial feed to perform hobbing on the worm gear. In order to improve the accuracy of worm gear processing, it is necessary to ensure the fixity of the worm gear during processing. The clamping of the existing worm gear is usually controlled by the loosening and tightening of the three-jaw chuck on the hobbing machine. Each time a worm gear is processed, the three-jaw chuck must be loosened and tightened and the worm gear position must be readjusted to ensure coaxiality, resulting in slow changeover efficiency and unstable quality. This is labor-intensive and time-consuming, thus affecting the efficiency and quality of worm gear processing. Utility Model Content

[0004] Therefore, the technical problem solved by the present invention is to overcome the problem in the prior art that the worm gear is clamped and controlled by a three-jaw chuck on a gear hobbing machine. Each time a worm gear is processed, the three-jaw chuck must be loosened or tightened and the position of the worm gear must be readjusted, resulting in slow changing efficiency and unstable quality, which affects the worm gear processing efficiency.

[0005] In order to solve the above technical problems, the utility model provides a mandrel fixture for worm gear processing, comprising:

[0006] The core shaft body includes a central recessed hole provided at one end thereof;

[0007] A chuck device, clamped and fixed on the other end of the mandrel body;

[0008] A limiting boss is formed on the core shaft body, and one side of the limiting boss cooperates with and abuts against the chuck device;

[0009] The locking sleeve is movably arranged on the core shaft body through a threaded structure and is arranged opposite to the other side of the limiting boss. The worm gear part sleeved on the core shaft body is pressed and fastened on the limiting boss by the locking sleeve.

[0010] In the above-mentioned core shaft clamp, the threaded structure includes a screw portion extending along the axial direction of the core shaft body and provided at one end of the core shaft body, and a threaded hole penetrating the locking sleeve and cooperating with the screw portion.

[0011] In the above-mentioned core shaft clamp, the locking sleeve has an outer periphery with a polygonal structure, and a buffer washer located on the inner side of the locking sleeve is sleeved on the core shaft body.

[0012] In the above-mentioned core shaft fixture, a positioning structure for circumferentially positioning the worm gear part on the core shaft body is provided between the core shaft body and the worm gear part.

[0013] In the above-mentioned core shaft fixture, the positioning structure is a flat key structure provided between the core shaft body and the worm gear component.

[0014] In the above-mentioned core shaft fixture, a positioning keyway suitable for installing the flat key structure is provided on the side wall of the core shaft body, and the flat key structure is higher than the keyway and is in extrusion contact with the inner hole of the worm gear part.

[0015] In the above-mentioned core shaft fixture, the positioning structure is a pin structure or a wedge structure provided between the core shaft body and the worm gear component.

[0016] In the above-mentioned core shaft fixture, the central concave hole is a tapered hole structure provided at one end of the core shaft body.

[0017] In the above-mentioned core shaft clamp, the chuck device includes an outer shell having a central cavity, a driving core movably inserted into the central cavity, and a clamping hole formed at one end of the driving core. Two elastic pressure blocks constituting the clamping hole are relatively formed at one end of the driving core. A conical guide opening is provided in one end of the central cavity, and the two elastic pressure blocks respectively have a conical surface adapted to be connected to the inner wall of the conical guide opening.

[0018] In the above-mentioned core shaft clamp, the other end of the driving core is a threaded end extending out of the central cavity, and the threaded end is used to connect to the gear hobbing machine; the outer shell includes a baffle that cooperates with the limiting boss to abut against it.

[0019] The technical solution of the utility model has the following advantages over the prior art:

[0020] 1. The utility model provides a mandrel clamp for worm gear processing, wherein a chuck device is installed on one end of the mandrel body and a central concave hole is provided at the other end thereof, the mandrel body is installed on the gear hobbing machine through the chuck device, and then the worm gear part is installed on the mandrel body, and the worm gear part is locked on the mandrel body through the opposite clamping cooperation of the locking sleeve and the limiting boss to ensure the tightness and stability of the installation of the worm gear part, so as to prevent the worm gear part from shaking during gear hobbing. The mandrel clamp designed by the technical solution can realize the worm gear part It can be quickly clamped and fixed on the gear hobbing machine for gear hobbing, ensuring that the gear hobbing is based on the inner hole of the worm gear center as the positioning reference, improving the processing accuracy, and can be applied to different types of worm gears. It is convenient for worm gear clamping and replacement, which not only improves the quality of part processing, but also improves the processing efficiency. Moreover, this type of worm gear part can be transferred to the external circle grinding process after gear hobbing is completed by using the mandrel clamp. In this way, two processing steps can be completed with one clamping, and the concentricity requirements can be stably guaranteed, which can realize the continuous flow layout of the workshop and facilitate automated production.

[0021] 2. The utility model provides a core shaft clamp for worm gear processing, in which the locking sleeve is movably arranged on the core shaft body by a threaded connection method. After the worm gear part is installed into the core shaft body, the locking sleeve is rotated to move along the axial direction of the core shaft body, and presses on one end of the worm gear part, so that the other end of the worm gear part is restricted to abut against the limiting boss, so that the locking sleeve is fixed and cooperates with the limiting boss to press the worm gear part toward each other, thereby realizing the clamping installation of the worm gear part on the core shaft body, and by providing a buffer washer between the locking sleeve and the worm gear part, hard extrusion and rotation friction between the locking sleeve and the worm gear part can be avoided, thereby protecting the worm gear part.

[0022] 3. The utility model provides a core shaft clamp for worm gear processing. After the worm gear part is installed into the core shaft body, according to the certain hole-axis gap between the worm gear part and the core shaft body, during the part clamping and subsequent processing, in order to prevent the relative rotation between the worm gear part and the core shaft body, a positioning structure is provided between the core shaft body and the worm gear part. The positioning structure preferably adopts a flat key structure provided between the core shaft body and the worm gear part. The flat key structure is used to achieve circumferential positioning effect of the worm gear part mounted on the core shaft body. The positioning accuracy is high, the disassembly and assembly are convenient, and it can also withstand large vibration and impact loads, thereby ensuring the stability and reliability of the installation of the core shaft body and the worm gear part.

[0023] 4. The utility model provides a core shaft clamp for worm gear processing, in which a tapered guide opening is provided in one end of the central cavity, and two elastic pressure blocks respectively have tapered surfaces that are adapted to be connected with the inner wall of the tapered guide opening. The driving core and the tapered guide opening of this structural design are connected with each other by a tapered fit. When the driving core drives the two elastic pressure blocks to move to the side away from the tapered guide opening, the two elastic pressure blocks are squeezed by the change in the tapered aperture of the tapered guide opening to produce elastic deformation, thereby firmly clamping one end of the core shaft body by narrowing the clamping opening, and the clamping grip is stable and reliable, which not only enhances the tightness of the connection between the two, but also has good coaxiality, is convenient for installation and disassembly, and improves processing efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the mandrel fixture provided by the utility model;

[0026] Figure 2 This is a schematic diagram of the planar structure of the mandrel fixture of the present utility model;

[0027] Figure 3 This is a schematic cross-sectional view of the mandrel fixture of the present invention in a clamped state;

[0028] Figure 4 This is a schematic structural diagram of the core shaft body of the present utility model;

[0029] Explanation of the accompanying drawings: 1. Mandrel body; 11. Round shaft end; 12. Positioning keyway; 2. Limiting boss; 3. Locking sleeve; 4. Chuck device; 40. Clamping hole; 41. Outer shell; 42. Driving core; 43. Elastic pressure block; 44. Conical guide port; 45. Threaded end; 46. Baffle; 5. Center recessed hole; 6. Buffer washer; 7. Flat key structure; 8. Worm gear part; A. Threaded connecting sleeve; B. Center. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] Example

[0034] The present embodiment will be described in detail below with reference to the accompanying drawings:

[0035] This embodiment provides Figure 1-4 The shown type of core shaft fixture for worm gear processing includes a core shaft body 1, a chuck device 4, a locking sleeve 3 and a limiting boss 2 formed on the core shaft body 1, wherein the core shaft body 1 includes a central recessed hole 5 arranged at one end thereof; the chuck device 4 is clamped and fixed on the other end of the core shaft body 1, and the chuck device 4 can be used to be adapted for installation on a gear hobbing machine; one side of the limiting boss 2 cooperates with the chuck device 4 to abut against each other; the locking sleeve 3 is movably arranged on the core shaft body 1 through a threaded structure, and is arranged opposite to the other side of the limiting boss 2. After the worm gear part 8 is installed into the core shaft body 1, it is tightened with the locking sleeve 3, so that the worm gear part 8 sleeved on the core shaft body 1 is pressed and tightened on the limiting boss 2 by the locking sleeve. The worm gear part of this embodiment adopts the clamping method of the core shaft fixture to realize the processing steps of gear hobbing and outer circle grinding.

[0036] In the above embodiment, according to the installation of a chuck device 4 on one end of the core shaft body 1 and the provision of a central recessed hole 5 at the other end thereof, the core shaft body 1 is installed on the gear hobbing machine through the chuck device 4, and then the worm gear part 8 is installed on the core shaft body 1, and the worm gear part 8 is locked on the core shaft body 1 through the opposite clamping cooperation of the locking sleeve 3 and the limiting boss 2 to ensure the tightness and stability of the installation of the worm gear part, so as to prevent the worm gear part 8 from shaking during the gear hobbing process, and then the center recessed hole 5 of the core shaft body 1 is supported by the top B on the gear hobbing machine, and the subsequent gear hobbing process can be carried out after the calibration is completed. The core shaft fixture designed in the scheme can realize the rapid clamping of worm gear parts and fix them on the gear hobbing machine for gear hobbing processing, ensuring that the gear hobbing processing is processed with the center inner hole of the worm gear as the positioning reference, improving the processing accuracy, and can be applied to different types of worm gears. It is more convenient for worm gear clamping and replacement operations, which not only improves the quality of part processing, but also improves the processing efficiency. Moreover, this worm gear part 8 can be transferred to the external circle grinding process after completing gear hobbing using the core shaft fixture. In this way, two processing steps can be completed with one clamping, and its concentricity requirements can be stably guaranteed, which can realize the continuous flow layout of the workshop and facilitate automated production.

[0037] It is further preferred that the threaded structure includes a screw portion extending along the axial direction of the core shaft body 1 and arranged at one end of the core shaft body 1, and a threaded hole provided on the locking sleeve 3 and cooperating with the screw portion. The locking sleeve 3 is moved along the axial direction of the core shaft body 1 toward or away from the limiting boss 2 through the cooperation of the screw portion and the threaded hole. In this way, the worm gear part sleeved on the core shaft body 1 can be clamped or loosened, and installation and disassembly are relatively convenient. The locking sleeve 3 has a polygonal outer periphery, which is convenient for the operator to apply force to rotate the locking sleeve 3. As can be seen from the above, after the worm gear part is installed into the core shaft body 1, the locking sleeve 3 is rotated to move along the axial direction of the core shaft body, and presses on one end of the worm gear part, so that the other end of the worm gear part is restricted to abut against the limiting boss 2, so that the locking sleeve 3 is fixed and cooperates with the limiting boss 2 to press the worm gear part 8 toward each other, thereby realizing the clamping installation of the worm gear part on the core shaft body, and by providing a buffer washer 6 located on the inner side of the locking sleeve 3 on the core shaft body 1, hard extrusion and rotation friction between the locking sleeve and the worm gear part can be avoided, thereby protecting the worm gear part.

[0038] In this embodiment, after the worm gear part 8 is installed into the core shaft body 1, since there is a certain hole-axis gap between the worm gear part 8 and the core shaft body 1, during the parts clamping and subsequent processing, in order to prevent relative rotation between the worm gear part 8 and the core shaft body 1, a positioning structure for circumferential positioning of the worm gear part on the core shaft body 1 is provided between the core shaft body 1 and the worm gear part 8.

[0039] As a preferred embodiment, refer to Figure 1-3 The positioning structure is a flat key structure 7 disposed between the mandrel body 1 and the worm gear component 8. Specifically, a positioning key slot 12 suitable for mounting the flat key structure is provided on the side wall of the mandrel body 1. The flat key structure 7 is elevated above the key slot and is in press-contact with the inner side wall of the worm gear component 8. The flat key connection achieves circumferential positioning of the worm gear component mounted on the mandrel body 1, achieving high positioning accuracy, easy assembly and disassembly, and the ability to withstand large vibration and impact loads, ensuring stable and reliable installation of the mandrel body and worm gear component.

[0040] As an alternative to the above, the positioning structure is a pin structure provided between the core shaft body 1 and the worm gear part 8. The pin structure includes a cylindrical pin radially extending through the core shaft body 1 and the worm gear part 8. The pin connection can also achieve circumferential positioning of the worm gear part 8 on the core shaft body 1. In addition, the positioning structure can be provided in other different ways, such as a wedge key connection between the core shaft body 1 and the worm gear part 8. Those skilled in the art can make a choice of the specific arrangement of the positioning structure based on the above description, and will not be described in detail here.

[0041] Combine Figure 2-3 As shown, the other end of the core shaft body 1 is a round shaft end 11 suitable for being inserted into the clamping opening of the chuck device 4. The round shaft end 11 is integrally connected to one side of the limiting boss 2. The central concave hole 5 is a tapered hole structure provided at one end of the core shaft body 1. The worm gear part in this embodiment is clamped to the core shaft fixture and fixed to the gear hobbing machine through the chuck device 4. Then the top of the gear hobbing machine is adapted to be pressed against the central concave hole 5 (see Appendix). Figure 3 B represents the top), after the calibration is completed, the worm gear part 8 can be hobbed, so that the two ends of the core shaft body 1 can be coaxially positioned and installed, which can ensure the coaxiality of the worm gear processing.

[0042] Combine Figure 1-3As shown, the chuck device 4 includes an outer shell 41 with a central cavity, a driving core 42 that is movably arranged in the central cavity, and a clamping hole 40 formed at one end of the driving core 42. Two elastic pressure blocks 43 constituting the clamping hole 40 are relatively formed at one end of the driving core. A conical guide opening 44 is provided in one end of the central cavity. The two elastic pressure blocks 43 respectively have conical surfaces that are adapted to be connected to the inner wall of the conical guide opening 44. The driving core 42 of this chuck device 4 is installed and connected with a gear hobbing machine or a grinder, and the driving core 42 is driven to move along the axial direction of the central cavity by the driving structure on the gear hobbing machine or the grinder. The driving core 42 and the tapered guide opening 44 of the above-mentioned structural design are connected with each other by a tapered fit. When the driving core 42 drives the two elastic pressure blocks 43 to move to the side away from the tapered guide opening 44, the two elastic pressure blocks 43 are squeezed by the change in the tapered aperture of the tapered guide opening 44 to produce elastic deformation, thereby firmly clamping one end of the core shaft body 1 by narrowing the clamping opening. The clamping grip is stable and reliable, which not only enhances the tightness of the connection between the two, but also has good coaxiality, is convenient for installation and disassembly, and improves processing efficiency and quality.

[0043] It is further preferred that the other end of the driving core 42 is a threaded end 45 extending out of the central cavity, and the threaded end 45 is used to connect to the gear hobbing machine. The outer shell 41 includes a baffle 46 that cooperates with the limiting boss 2. The cooperation between the baffle 46 and the limiting boss 2 defines the installation distance of the core shaft body 1 inserted into the clamping port. Correspondingly, the gear hobbing machine or the grinding machine is provided with a threaded coupling sleeve (attached) for connecting the driving core 42. Figure 3 (A in the figure represents a threaded connection sleeve), and installation can be achieved by simply matching and connecting the threaded end 45 of the driving core 42 to the threaded connection sleeve. Installation and disassembly are relatively convenient, which is conducive to improving work efficiency.

[0044] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A mandrel fixture for worm gear processing, characterized in that: include: The mandrel body (1) comprises a central recessed hole (5) arranged at one end thereof; A chuck device (4) is clamped and fixed on the other end of the mandrel body (1); A limiting boss (2) is formed on the mandrel body (1), and one side of the limiting boss (2) is matched and abutted against the clamping device (4); The locking sleeve (3) is movably arranged on the spindle body (1) through a threaded structure and is arranged opposite to the other side of the limiting boss (2). The worm gear part (8) sleeved on the spindle body (1) is pressed and fastened on the limiting boss (2) by the locking sleeve.

2. The mandrel fixture for worm gear machining according to claim 1, characterized in that: The thread structure comprises a screw rod portion extending along the axial direction of the core shaft body (1) and arranged at one end of the core shaft body (1), and a threaded hole penetrating the locking sleeve (3) and cooperating with the screw rod portion.

3. The mandrel fixture for worm gear machining according to claim 2, characterized in that: The locking sleeve (3) has an outer periphery with a polygonal structure, and a buffer washer (6) located on the inner side of the locking sleeve (3) is sleeved on the core shaft body (1).

4. The mandrel fixture for worm gear machining according to any one of claims 1 to 3, characterized in that: A positioning structure for circumferentially positioning the worm wheel part (8) on the spindle body (1) is provided between the spindle body (1) and the worm wheel part (8).

5. The mandrel fixture for worm gear machining according to claim 4, characterized in that: The positioning structure is a flat key structure (7) arranged between the spindle body (1) and the worm gear part (8).

6. The mandrel fixture for worm gear machining according to claim 5, characterized in that: A positioning keyway (12) suitable for installing the flat key structure is provided on the side wall of the spindle body (1), and the flat key structure (7) is higher than the keyway and is in extrusion contact with the inner hole side wall of the worm gear part.

7. The mandrel fixture for worm gear machining according to claim 4, characterized in that: The positioning structure is a pin structure arranged between the spindle body (1) and the worm gear part (8).

8. The mandrel fixture for worm gear machining according to claim 1, characterized in that: The central concave hole (5) is a tapered hole structure arranged at one end of the core shaft body (1).

9. The mandrel fixture for worm gear machining according to claim 1, characterized in that: The clamping device (4) comprises an outer shell (41) having a central cavity, a driving core (42) movably inserted into the central cavity, and a clamping hole (40) formed at one end of the driving core (42), two elastic pressure blocks (43) constituting the clamping hole (40) are formed at one end of the driving core, and a conical guide opening (44) is provided in one end of the central cavity, and the two elastic pressure blocks (43) respectively have conical surfaces adapted to be connected to the inner wall of the conical guide opening (44).

10. The mandrel fixture for worm gear machining according to claim 9, characterized in that: The other end of the driving core (42) is a threaded end (45) extending out of the central cavity, and the threaded end (45) is used to connect to a gear hobbing machine; the outer shell (41) includes a baffle (46) that cooperates with the limiting boss (2) to abut against it.

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